Akramul Hasan

This is a very straightforward tiny but useful plugin to add a block element that will help to create the Frequently Asked Questions (FAQ) section. It is very easy to use. After installing this plugin, a custom block item will be available, which will have a repeater pair of fields to add a question and answer. In the front end, it will generate a nice and smooth collapsible FAQ section.
<ul>
<li>No Extra library or script</li>
<li>Very lightweight and easy to use</li>
</ul>

WPFY FAQ Block

Gutenberg Block plugin for Frequently Asked Questions (FAQ) feature. Very straight forward to use. Just install and enjoy.

Ayebare Mucunguzi Brooks

Provides A nice Frequently asked Questions Page with answers hidden untill the question is clicked then the desired answer fades smoothly into view. 
Having FAQ’s on one page can help improve customer service by providing immediate answers 24/7. Unfortunately, 
most FAQ pages are either one very long page full of questions and complete answers, 
or a single page of questions that link to separate answer pages. Both solutions 
slow down the visitor’s search for answers: in the first case, forcing a visitor to scroll 
down a long page for the question and answer she’s after, and in the second case, 
making the visitor wait for a new page to load. 
This light weight plugin uses the already installed wordpress jquery library to solve that problem. 
Multiple Categories of FAQ’s are now supported. See Installation for details.

Smart FAQ

Provides A nice Frequently asked Questions Page with answers hidden untill the question is clicked then the desired answer fades smoothly into view.

WPFY FAQ Block vs Smart FAQ